package com.microblog.microblogsystem.handler;


import com.microblog.microblogsystem.constant.MessageConstant;
import com.microblog.microblogsystem.exception.BaseException;
import com.microblog.microblogsystem.result.Result;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;

import java.sql.SQLIntegrityConstraintViolationException;

/**
 * 全局异常处理器，处理项目中抛出的业务异常
 */
@RestControllerAdvice  //表示当前类为全局异常处理器
@Slf4j
public class GlobalExceptionHandler {

    /**
     * 捕获业务异常
     * @param ex
     * @return
     */
    @ExceptionHandler  //指定可以捕获哪种类型的异常进行处理
    public Result exceptionHandler(BaseException ex){
        log.error("异常信息：{}", ex.getMessage());
        return Result.error(ex.getMessage());
    }

    /**
     * 处理SQL异常
     * @param ex
     * @return
     */
    @ExceptionHandler //指定可以捕获哪种类型的异常进行处理
    public Result exceptionHandler(SQLIntegrityConstraintViolationException ex) {
        //Duplicate entry 'zhangsan' for key 'employee.idx_username'
        String message = ex.getMessage();
        if (message.contains("Duplicate entry")) {
            String[] split = message.split(" ");
            String username = split[2];
            String msg = username + MessageConstant.ALREADY_EXISTS;
            log.error("异常信息：{}", msg);
            return Result.error(msg);
        } else {
            log.error("异常信息：{}", MessageConstant.UNKNOWN_ERROR);
            return Result.error(MessageConstant.UNKNOWN_ERROR);
        }
    }
}
